July 2010 6 – 71
Indirect position
measurement
With indirect position measurement, couplings and transmission systems (belts, gears, etc.),
ball screw with recirculating ball nut, guideways are outside the control loop.
Flowchart See ”Position Measurement via Motor Encoder (Indirect Position Measurement)” on page 18 –
311.
Conclusion If with indirect measurement, e.g., the unusual traversing noise is fainter or if there is no noise
at all, the error cause may be due to the mechanics of the machine (e.g., reversal error, worn
guideways).
For indirect path measurement the direct encoder (scale, scale tape) is not required.
Consequently, the direct encoder may be the error cause.
Observe the quality of the encoder signals (e.g. with a PWT 18 (for 1Vpp) or with PWM 9)
while moving the table with indirect path measurement.
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